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I turned this touchscreen RP2040 into a touchpad. (lemmy.world)
submitted 3 years ago* (last edited 3 years ago) by to c/ergomechkeyboards@lemmy.world
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I took a WaveShare RP2040-Touch-LCD-1.28and made a program to use it as a touchscreen. This is still very much in the beta phase but the proof of concept works. Here’s my GitHub repo for it.

I’m planning on integrating it into my next split near the thumb cluster.

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[–] [S] 3 points 3 years ago* (2 children)

There are 6 GPIO available. So maybe a macro Pad… but my idea is do embed it in The case but still have a separate usb cable to it. You can also display things on the screen if you’d like. It has a RTC and a battery management circuit so you could make it into a clock, or use the GPIO to speak with your keyboard to send keystrokes data via serial…

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  • [–] 2 points 3 years ago (1 child)

    I guess if the available pins support i2c you could hook it up to a gpio expander

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  • [–] [S] 5 points 3 years ago* (last edited 3 years ago)

    Yes. It does I2C. It’s also a pi Pico core so dual core. So you could use a separate core to drive the screen independently from the keyboard to keep them fast.

    Edit: actually the i2C is not exposed on the pins, but you should be able to use the BitBang_I2C library to expose them on any pair of GPIO pins. I’ll try it out and report back.

    Edit2: actually, no need for that library you can set virtual I2C to any pins I tried it with another project on the same board.

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